Experimental and modeling of isothermal crystallization of peek matrix and c/peek composites with application of parallel Avrami model
Résumé
Isothermal crystallization kinetics of neat PEEK (Poly(Ether-EtherKetone)) and carbon fibers reinforced PEEK (30% in mass) were studied and modeled. A differential scanning calorimeter was used to monitor heat flow during isothermal crystallization between 300°C and 310°C. PEEK thermoplastic polymer exhibits a particular crystallization that induces a double melting peak after isothermal crystallization that is described by a model that features two competing nucleation and growth mechanisms. Concerning neat PEEK and reinforced PEEK respectively, the first mechanism is a primary crystallization with Avrami's coefficient of 2.1 (resp.3.2), the second is interlamellar crystallization with Avrami's coefficient of 1.7 (resp. 2.7). Kinetics parameters are identified, and confirm the influence of fibers on crystallization kinetic.
Domaines
Sciences de l'ingénieur [physics]
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Experimental-and-Modeling-of-Isothermal-crystallization-of-PEEK.pdf (231.95 Ko)
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